CVE-2026-68154 PUBLISHED

libceph: reject zero bucket types in crush_decode

Assigner: Linux
Reserved: 30.07.2026 Published: 10.08.2026 Updated: 10.08.2026

In the Linux kernel, the following vulnerability has been resolved:

libceph: reject zero bucket types in crush_decode

CRUSH bucket type 0 is reserved for devices. The mapper relies on that invariant and uses type 0 to identify leaf devices.

If crush_decode() accepts a bucket with type 0, a malformed CRUSH map can make the mapper treat a negative bucket ID as a device and pass it to is_out(), which then indexes the OSD weight array with a negative value.

Reject zero bucket types while decoding the CRUSH map so the invalid state never reaches the mapper.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from f24e9980eb860d8600cbe5ef3d2fd9295320d229 to b8a9fb6bf806f9c4891e71ae1beab0c07c23a877 (excl.)
  • affected from f24e9980eb860d8600cbe5ef3d2fd9295320d229 to 826cd1de5802fd392922785f9b64d76e65d2a100 (excl.)
  • affected from f24e9980eb860d8600cbe5ef3d2fd9295320d229 to 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56 (excl.)
  • affected from f24e9980eb860d8600cbe5ef3d2fd9295320d229 to 70998f91030ee083ecb336a1dff0701c20a38081 (excl.)
  • affected from f24e9980eb860d8600cbe5ef3d2fd9295320d229 to 05f90284223381005d6bcddab3fda4a97f9c3401 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 2.6.34 is affected
  • unaffected from 0 to 2.6.34 (excl.)
  • unaffected from 6.6.148 to 6.6.* (incl.)
  • unaffected from 6.12.101 to 6.12.* (incl.)
  • unaffected from 6.18.42 to 6.18.* (incl.)
  • unaffected from 7.1.6 to 7.1.* (incl.)
  • unaffected from 7.2-rc5 to * (incl.)

References